Journal
SCIENCE
Volume 291, Issue 5503, Pages 468-471Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.291.5503.468
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The dispersion of longitudinal acoustic phonons was measured by inelastic x-ray scattering in the hexagonal closed-packed (hcp) structure of iron from 19 to 110 gigapascals. Phonon dispersion curves were recorded on polycrystalline iron compressed in a diamond anvil cell, revealing an increase of the Longitudinal wave velocity (V-p) from 7000 to 8800 meters per second. We show that hcp iron follows a Birch law for V-p, which is used to extrapolate velocities to inner core conditions. Extrapolated Longitudinal acoustic wave velocities compared with seismic data suggest an inner core that is 4 to 5% Lighter than hcp iron.
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